Android: how to capture screen in gingerbread (screenshot in 2.3 ).

Original post address: http://blog.csdn.net/zmyde2010/article/details/6925498#reply thanks todo: Android; LINUX; cloud;

The sample code is as follows:

Frameworks \ base \ Services \ surfaceflinger \ tests \ screencap. cpp

/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#include <utils/Log.h>#include <binder/IPCThreadState.h>#include <binder/ProcessState.h>#include <binder/IServiceManager.h>#include <binder/IMemory.h>#include <surfaceflinger/ISurfaceComposer.h>#include <SkImageEncoder.h>#include <SkBitmap.h>using namespace android;int main(int argc, char** argv){    if (argc != 2) {        printf("usage: %s path\n", argv[0]);        exit(0);    }    const String16 name("SurfaceFlinger");    sp<ISurfaceComposer> composer;    getService(name, &composer);    sp<IMemoryHeap> heap;    uint32_t w, h;    PixelFormat f;    status_t err = composer->captureScreen(0, &heap, &w, &h, &f, 0, 0);    if (err != NO_ERROR) {        fprintf(stderr, "screen capture failed: %s\n", strerror(-err));        exit(0);    }    printf("screen capture success: w=%u, h=%u, pixels=%p\n",            w, h, heap->getBase());    printf("saving file as PNG in %s ...\n", argv[1]);    SkBitmap b;    b.setConfig(SkBitmap::kARGB_8888_Config, w, h);    b.setPixels(heap->getBase());    SkImageEncoder::EncodeFile(argv[1], b,            SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);    return 0;}

Compile and generate/system/bin/test-screencap

Enter test-screencap/mnt/sdcard/scapxx.png

You can see scapxx.png. The default size is the screen resolution.

If you want to write this function to your own application

Write a JNI file. Refer to the code above, but remember the permission statement.

<SPAN style="FONT-SIZE: 24px"><uses-permission android:name="android.permission.READ_FRAME_BUFFER" /></SPAN>

 

Post the JNI code, or resource: http://download.csdn.net/detail/zmyde2010/3835127

JNI/com_android_screencap_screencapnative.cpp

/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#define LOG_TAG "ScreenCapNative-JNI"//#define LOG_NDEBUG 0#include "JNIHelp.h"#include "jni.h"#include <utils/Log.h>#include <binder/IPCThreadState.h>#include <binder/ProcessState.h>#include <binder/IServiceManager.h>#include <binder/IMemory.h>#include <surfaceflinger/ISurfaceComposer.h>#include <SkImageEncoder.h>#include <SkBitmap.h>namespace android {static void android_ScreenCap_ScreenCapNative_nativeCaptureScreen(JNIEnv* env,        jobject obj, jstring file) {const char *file_path = env->GetStringUTFChars(file, NULL);    const String16 name("SurfaceFlinger");    sp<ISurfaceComposer> composer;    getService(name, &composer);    sp<IMemoryHeap> heap;    uint32_t w, h;    PixelFormat f;    status_t err = composer->captureScreen(0, &heap, &w, &h, &f, 0, 0);    if (err != NO_ERROR) {        LOGE("screen capture failed: %s\n", strerror(-err));        exit(0);    }    LOGD("screen capture success: w=%u, h=%u, pixels=%p\n",            w, h, heap->getBase());    LOGD("saving file as PNG in %s ...\n", file_path);    SkBitmap b;    b.setConfig(SkBitmap::kARGB_8888_Config, w, h);    b.setPixels(heap->getBase());    SkImageEncoder::EncodeFile(file_path, b,            SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);        }static JNINativeMethod gScreenCapNativeMethods[] = {    /* name, signature, funcPtr */    { "nativeCaptureScreen", "(Ljava/lang/String;)V",            (void*) android_ScreenCap_ScreenCapNative_nativeCaptureScreen },            };int register_android_ScreenCap_ScreenCapNative(JNIEnv* env) {    int res = jniRegisterNativeMethods(env, "com/android/ScreenCap/ScreenCapNative",            gScreenCapNativeMethods, NELEM(gScreenCapNativeMethods));    LOG_FATAL_IF(res < 0, "Unable to register native methods.");    return 0;}extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved){    JNIEnv* env = NULL;    jint result = -1;    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {        LOGE("GetEnv failed!");        return result;    }    LOG_ASSERT(env, "Could not retrieve the env!");    register_android_ScreenCap_ScreenCapNative(env);    return JNI_VERSION_1_4;}} /* namespace android */

JNI/Android. mk

 

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES := com_android_ScreenCap_ScreenCapNative.cppLOCAL_C_INCLUDES += \$(JNI_H_INCLUDE)LOCAL_SHARED_LIBRARIES := \libnativehelper \libcutils \libutils \libbinder \libskia \    libui \    libsurfaceflinger_clientLOCAL_C_INCLUDES += \external/skia/include/core \external/skia/include/effects \external/skia/include/images \external/skia/src/ports \external/skia/include/utilsLOCAL_MODULE:= libscreencapjniLOCAL_MODULE_TAGS := optionalLOCAL_PRELINK_MODULE := falseinclude $(BUILD_SHARED_LIBRARY)